1/* crypto/hmac/hmac.c */ 2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58#include <stdio.h> 59#include <stdlib.h> 60#include <string.h> 61#include "cryptlib.h" 62#include <openssl/hmac.h> 63 64#ifdef OPENSSL_FIPS 65#include <openssl/fips.h> 66#endif 67 68int HMAC_Init_ex(HMAC_CTX *ctx, const void *key, int len, 69 const EVP_MD *md, ENGINE *impl) 70 { 71 int i,j,reset=0; 72 unsigned char pad[HMAC_MAX_MD_CBLOCK]; 73 74#ifdef OPENSSL_FIPS 75 if (FIPS_mode()) 76 { 77 /* If we have an ENGINE need to allow non FIPS */ 78 if ((impl || ctx->i_ctx.engine) 79 && !(ctx->i_ctx.flags & EVP_CIPH_FLAG_NON_FIPS_ALLOW)) 80 { 81 EVPerr(EVP_F_HMAC_INIT_EX, EVP_R_DISABLED_FOR_FIPS); 82 return 0; 83 } 84 /* Other algorithm blocking will be done in FIPS_cmac_init, 85 * via FIPS_hmac_init_ex(). 86 */ 87 if (!impl && !ctx->i_ctx.engine) 88 return FIPS_hmac_init_ex(ctx, key, len, md, NULL); 89 } 90#endif 91 92 if (md != NULL) 93 { 94 reset=1; 95 ctx->md=md; 96 } 97 else 98 md=ctx->md; 99 100 if (key != NULL) 101 { 102 reset=1; 103 j=EVP_MD_block_size(md); 104 OPENSSL_assert(j <= (int)sizeof(ctx->key)); 105 if (j < len) 106 { 107 if (!EVP_DigestInit_ex(&ctx->md_ctx,md, impl)) 108 goto err; 109 if (!EVP_DigestUpdate(&ctx->md_ctx,key,len)) 110 goto err; 111 if (!EVP_DigestFinal_ex(&(ctx->md_ctx),ctx->key, 112 &ctx->key_length)) 113 goto err; 114 } 115 else 116 { 117 OPENSSL_assert(len>=0 && len<=(int)sizeof(ctx->key)); 118 memcpy(ctx->key,key,len); 119 ctx->key_length=len; 120 } 121 if(ctx->key_length != HMAC_MAX_MD_CBLOCK) 122 memset(&ctx->key[ctx->key_length], 0, 123 HMAC_MAX_MD_CBLOCK - ctx->key_length); 124 } 125 126 if (reset) 127 { 128 for (i=0; i<HMAC_MAX_MD_CBLOCK; i++) 129 pad[i]=0x36^ctx->key[i]; 130 if (!EVP_DigestInit_ex(&ctx->i_ctx,md, impl)) 131 goto err; 132 if (!EVP_DigestUpdate(&ctx->i_ctx,pad,EVP_MD_block_size(md))) 133 goto err; 134 135 for (i=0; i<HMAC_MAX_MD_CBLOCK; i++) 136 pad[i]=0x5c^ctx->key[i]; 137 if (!EVP_DigestInit_ex(&ctx->o_ctx,md, impl)) 138 goto err; 139 if (!EVP_DigestUpdate(&ctx->o_ctx,pad,EVP_MD_block_size(md))) 140 goto err; 141 } 142 if (!EVP_MD_CTX_copy_ex(&ctx->md_ctx,&ctx->i_ctx)) 143 goto err; 144 return 1; 145 err: 146 return 0; 147 } 148 149int HMAC_Init(HMAC_CTX *ctx, const void *key, int len, const EVP_MD *md) 150 { 151 if(key && md) 152 HMAC_CTX_init(ctx); 153 return HMAC_Init_ex(ctx,key,len,md, NULL); 154 } 155 156int HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, size_t len) 157 { 158#ifdef OPENSSL_FIPS 159 if (FIPS_mode() && !ctx->i_ctx.engine) 160 return FIPS_hmac_update(ctx, data, len); 161#endif 162 return EVP_DigestUpdate(&ctx->md_ctx,data,len); 163 } 164 165int HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len) 166 { 167 unsigned int i; 168 unsigned char buf[EVP_MAX_MD_SIZE]; 169#ifdef OPENSSL_FIPS 170 if (FIPS_mode() && !ctx->i_ctx.engine) 171 return FIPS_hmac_final(ctx, md, len); 172#endif 173 174 if (!EVP_DigestFinal_ex(&ctx->md_ctx,buf,&i)) 175 goto err; 176 if (!EVP_MD_CTX_copy_ex(&ctx->md_ctx,&ctx->o_ctx)) 177 goto err; 178 if (!EVP_DigestUpdate(&ctx->md_ctx,buf,i)) 179 goto err; 180 if (!EVP_DigestFinal_ex(&ctx->md_ctx,md,len)) 181 goto err; 182 return 1; 183 err: 184 return 0; 185 } 186 187void HMAC_CTX_init(HMAC_CTX *ctx) 188 { 189 EVP_MD_CTX_init(&ctx->i_ctx); 190 EVP_MD_CTX_init(&ctx->o_ctx); 191 EVP_MD_CTX_init(&ctx->md_ctx); 192 } 193 194int HMAC_CTX_copy(HMAC_CTX *dctx, HMAC_CTX *sctx) 195 { 196 if (!EVP_MD_CTX_copy(&dctx->i_ctx, &sctx->i_ctx)) 197 goto err; 198 if (!EVP_MD_CTX_copy(&dctx->o_ctx, &sctx->o_ctx)) 199 goto err; 200 if (!EVP_MD_CTX_copy(&dctx->md_ctx, &sctx->md_ctx)) 201 goto err; 202 memcpy(dctx->key, sctx->key, HMAC_MAX_MD_CBLOCK); 203 dctx->key_length = sctx->key_length; 204 dctx->md = sctx->md; 205 return 1; 206 err: 207 return 0; 208 } 209 210void HMAC_CTX_cleanup(HMAC_CTX *ctx) 211 { 212#ifdef OPENSSL_FIPS 213 if (FIPS_mode() && !ctx->i_ctx.engine) 214 { 215 FIPS_hmac_ctx_cleanup(ctx); 216 return; 217 } 218#endif 219 EVP_MD_CTX_cleanup(&ctx->i_ctx); 220 EVP_MD_CTX_cleanup(&ctx->o_ctx); 221 EVP_MD_CTX_cleanup(&ctx->md_ctx); 222 memset(ctx,0,sizeof *ctx); 223 } 224 225unsigned char *HMAC(const EVP_MD *evp_md, const void *key, int key_len, 226 const unsigned char *d, size_t n, unsigned char *md, 227 unsigned int *md_len) 228 { 229 HMAC_CTX c; 230 static unsigned char m[EVP_MAX_MD_SIZE]; 231 232 if (md == NULL) md=m; 233 HMAC_CTX_init(&c); 234 if (!HMAC_Init(&c,key,key_len,evp_md)) 235 goto err; 236 if (!HMAC_Update(&c,d,n)) 237 goto err; 238 if (!HMAC_Final(&c,md,md_len)) 239 goto err; 240 HMAC_CTX_cleanup(&c); 241 return md; 242 err: 243 return NULL; 244 } 245 246void HMAC_CTX_set_flags(HMAC_CTX *ctx, unsigned long flags) 247 { 248 EVP_MD_CTX_set_flags(&ctx->i_ctx, flags); 249 EVP_MD_CTX_set_flags(&ctx->o_ctx, flags); 250 EVP_MD_CTX_set_flags(&ctx->md_ctx, flags); 251 } 252